Ho model



'PATENTED JULY 12 190.4, G. DOYERE. STEAM GENERATOR.

APPLIOATION I'I LED Jun: 1, 1900.

2 SHEETS-SHEET 1. F16 2.

1T0 MODEL.

PATBNTED JULY 12, 1904.

C. DOYERE.

STEAM GENERATOR.

AYPLIOATION FILED mm. 1, 1900.

2 SHEETS-SHEBT 2 HO MODEL.

/ UNITED STATES 1 Patented Ju 12, 1904.

PATENT OFFICE.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 765,070, dated July 12,1904.

Application filed June 1, 1900. Serial No. 18,750. (No model.)

To all whom/ it may concern.-

Be it known that I, CHARLES DoYERE, a citizen of the Republic of France,residing at Foo- Chow, China, have invented certain new and usefulImprovements in or Relating to Steam- Generators, (for which I have madeapplication for Letters Patent in Great Britain under No. 2,686,dated'Februai'y 10, 1900; France, N o. 294E,966,dated December 5,1899;Belgium, No. 116,559, dated February 7, 1900, and Germany, No. 42,888,dated February 10, 1900,) of which the following is a specification.

The present invention relates to steam-generators and comprises an upperreservoir and a lower reservoir communicating with each other by curvedsteam-tubes and water-tubes, both held in'place by simple swaging orexpanding without any necessity for securing by means of screw-threadsor the like.

The principle on which the invention is based is as follows: The wholeof the bundle of tubes and the area of the upper and lower reservoiroccupied by the ends of the tube constitute a system of revolutionaround a common axis, the latter forming'with a general plan of theboiler and the plane of the furnace an arbitary angle. According to thecurve of the tubes the form adopted for the meridian of the tube areaboth on the upper and the lower reservoirs and according to theinclination of the axis of revolution of the series of tubes theprinciple described above when carried into effect gives rise to anumber of boiler types, which will be described, reference being had tothe accompanying drawings.

Figures 1, 3, 4, 5, and 6 represent vertical sectional views'ofdiflerent arrangements of a type of boiler of which the axis ofrevolution of the tubes is inclined. Fig. 2 is a sectional view on lineas m of Fig. 1.

The type of boiler represented by Figs. 1 to 6 is characterized by thefollowing fundamental features:

First. The area on the reservoirs a and b occupied by the tubes tformstwo revolutionsurfaces, with an inclined axis 0 0 contained in avertical plane to the axis of the grate 0, the meridians of theserevolution-surfaces consisting of either two converging lines when thearea occupied by the tubes consists of two cones d with the apicesopposite to each other, Fig. 1, or two curves with their convexityopposite to each other, as when two convex-tube areas a, Fig. 3, areemployed.

Second. The tubes 25 are circularly arched or curved and extendperpendicularly from the surface of the reservoirs CL and 5, anarrangement which allows of the tubes being inserted or removedseparately through one or the other of its connections by drawing them,as it were, out of 'the sheath formed by the-neighboring tubes aroundit. According to the type represented in Fig. 1 all the tubes being inthe same meridian plane have a common center as regards their "curves,the center being indicated by the point i where the two generatrices orprolongations of the cone sides d of the reservoirs meet. In the typerepresented in Fig. 8 the center of each tube in the meridian plane isthe point wherethe tangents of the said meridians of the reservoirsmeet. the tangent being drawn at the point of connection of the tube.

Third. The tubes of the inner rows are arranged at a certain distancefrom the apices of the two cones or cups forming the tube areas in sucha manner as to form round the axis 0 0 and in the center of the ovoidformed by the bundle of steam-generating tubes an ovoidal empty space f,which is isolated from the steam-tubes by a screen or partition 9. Inthe interior of this space is arranged a small series of curved tubes 8,connecting the two reservoirs a and 6, which tubes 8, being outside thedirect action of the flame and hot gases, are intended to serve aswater-circulating tubes.

Fourth. The angle of the cones d, or the amount of curvature of the twocups or curved surfaces 0, forming the tube area, the inclination of theaxis of revolution 0 0, the distance of the innermost row of tubes tfrom the axis 0 0, the relative position of the two reservoirs a and Z)are all variable items, which may be modified to suit each particularcase in order to modify as desired the medium inclination of the tubes,the extent of the heating-surface of the tubular system, thegratesurface, and the various conditions on which depend the length,width, or height of the boiler.

Fifth. The lower reservoir Z) is closed by a cover or surface lb of anyform. According to Fig. 1 this surface is a simple spherical cup.According to Fig. 8 it is developed into a cylindrical part, whichallows the volume of water to be increased, but which facilitates alsothe adjustment or the extraction of other tubes and the fixing of thetubes Without removing the cover by means of an examinationhole and thelike. Any other form may be adopted for instance, a cover concave on theoutside, so as to diminish the quantity of water, and so on.

Sixth. The same remarks will apply to the upper reservoir a, the form ofwhich beyond the area occupied by the tubes is evidently independent ofthe arrangement of the principle which constitutes the invention. Areservoir of any form united with the tube area by means of a forged orcast connection may be used, so as to vary at will the volume of water,the volume of steam, and the free surface above the water-level.According to Figs. 1 and 3 the reservoir a is supposed to be a circularstraight-sided cylinder directly connected with the base of the cone orthe cup forming the tube area. The diameter of this cylinder is arrangedwith regard to the length and curvature of the tubes in such a mannerthat they may be passed in and out through the holes of the plates intheinterior of this reservoir, as indicated by the dotted lines,therebyfacilitating by providing a manhole at a suitable point therepair or replacement of a tube; but this arrangement is not obligatoryand may be replaced in certain cases by an arrangement which permits theexchange of tubes to be effected from the back by opening the lowerreservoir.

Seventh. A modification rather different as regards form, but stillbelonging to the same kind of construction, is the type representedbyFig. 4C, in which the reservoirs a; and Z) are of any kind of formwith conical or concave cups and in which the tubes 5 present a convexform toward the axis 0 0.

Eighth. An intermediate type between the last and the preceding is thatin which one of the tube areas is a fiat surface and perpendicular tothe centralaxis, around which the tubes are arranged 6., a cone with anangle of one hundred and eighty degrees. This gives the two arrangementsschematically represented in Fig. 5 or Fig. 6, according as to whetherthe upper or the lower reservoir is flat, and the closing of such areservoir with plane-tube area being arbitrary this type may be used asa steam-generator with an upper or lower Water-plate.

In the type of generator described above it draft or for any otherpurpose.

will be evident that the dimensions of the va rious elements, as well astheaccessory arrangements, may be varied, and of course strengtheningdevices-such as ties, cross bars, and the likeas well as manholes andinspection-places for examining, cleaning, dismounting, and otherpurposes in connection with the type employed, will be provided wherenecessary. Further, the tubes, which may be curved or sinuous, need notbe closely or symmetrically arranged; but spaces may be left betweenthem, or some may be omitted, either for the purpose of increasing thespace above the grate or for facilitating the Finally, in some cases thewater-tubes 8 may be omitted or they may be prolonged into the interiorof the reservoirs by continuations or pipes passing into the fartherparts of the reservoirs. I claim- 1. A steam-generator comprising upperand lower reservoirs, a series of curved heatingtubes joining the saidreservoirs at approximately right angles to the same, water-circulatingtubes having a curvature corresponding to that of the heating-tubes andjoining the upper and lower reservoirs at approximately right angles tothe same, and a seating arranged between said heating-tubes and watercirculating tubes, as described, said heating and circulating tubes andsurfaces in which said tubes are fixed constituting asystern ofrevolution around a line which forms the common oblique central axis ofthe system constituted by the tubes and reservoirs. 2. Asteam-generatorcomprisingupperand lower reservoirs, a series of curved heatingtubesjoining the said reservoirs at approximately right angles to the same,said tubes being arranged concentrically around an oblique line formingan oblique central axis of both reservoirs and leaving a spaceimmediately surrounding the said central axis, watercirculating tubesarranged within the space around the central axis and joining the upperand lower reservoirs at right angles to the same, the curvature of saidwater-circulating tubes corresponding to that of the heatingtubes, thesaid heating and circulating tubes and surfaces in which said tubes arefixed constituting a system of revolution around a line V which formsthe common oblique central axis of the system constituted by said tubesand reservoirs.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

CH. DOYERE, Witn esses A. AUBIN, A. Donne.

